<i18n lang="foooo">
{"en": {
    "hello": "hello world!"
  }, "ja": {
    "hello": "こんにちは、世界！"
  }
}
</i18n>

<custom>
const foo =


     "foo";
</custom>

<custom lang="zzz">
const foo = "foo";
  const foo = "foo";</custom>

<custom lang="zzz">123</custom>

<custom>{
     foo: "bar"
}</custom>
